Balance Sheet - Schedule of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Seismic equipment lease pool and property and equipment:
Cost of seismic equipment lease pool and property and equipment	$ 200,673	$ 232,517
Accumulated depreciation and amortization	(170,831)	(188,679)
Total seismic equipment lease pool and property and equipment, net	29,842	43,838
Seismic Equipment Lease Pool [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	186,784	219,001
Land and Buildings [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	3,381	3,379
Furniture and Fixtures [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	9,796	9,462
Autos and Trucks [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	$ 712	$ 675